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Google Fi is great for this. Wherever I land abroad I'm connected within a minute and pay the same data rate that I do while at home.

What phone do you use for this or is it multiple phones, and what SIM or is it multiple SIMs?

With Google Fi you have to have a Google Pixel Phone, and it just works. Google is a MVNO so they can buy tower time from any carrier.

Edit: And yeah it's a single SIM.

Unfortunately it's only available to US customers.